Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for prevention of generation of power oscillation in main stop valve full-stroke test of steam turbine

A power oscillation and steam turbine technology, which is applied in the testing of mechanical components, testing of machine/structural components, measuring devices, etc., can solve problems such as excessive valve closing speed, tripping of machines and furnaces, parameter fluctuations, etc., to prevent power fluctuations And the effect of power oscillation, preventing power oscillation, and reducing the fluctuation range

Active Publication Date: 2018-03-06
ELECTRIC POWER SCI RES INST OF GUIZHOU POWER GRID CO LTD
View PDF6 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] The main causes of accidents caused by the activity test of the high-pressure main steam valve are as follows: 1. The setting of the high-pressure regulating valve position balance module is unreasonable; 2. The closing speed of the high-pressure main steam valve activity test is too fast; 3. The parameter setting of the power control circuit is improper ; 4. Unreasonable selection of test steam parameters
Measures currently taken and existing risks: 1. Since the full-stroke activity test of the main steam valve of the steam turbine brings relatively high risks, ranging from parameter fluctuations to serious tripping, many power plants only conduct part-stroke activity tests of valves. Or just perform a full stroke motion test before shutting down
2. In order to maintain the stability of the steam turbine load, when the power control circuit is put into operation, the valve activity test time is generally extended, which has a greater impact on the boiler combustion control under high load

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for prevention of generation of power oscillation in main stop valve full-stroke test of steam turbine
  • Method for prevention of generation of power oscillation in main stop valve full-stroke test of steam turbine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0032] The technical scheme of the invention is described in detail below in conjunction with the accompanying drawings. Taking the main steam valve 1 of the steam turbine unit, that is, the full stroke activity test of TV1, as an example, the steam turbine load is below 70% of the rated value, and the AGC is cut off, coordinated control, and primary frequency regulation. The steam turbine runs at Single valve, power control loop mode.

[0033] (1) When |Δp|

[0034] a) The load deviation value Δp is input to the PID controller 3 module after being judged by the judgment module a13, and then sequentially passes through the valve flow command module 4, the rate lim...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The present invention discloses a method for prevention of generation of power oscillation in a process of a main stop valve full-stroke test of a steam-turbine generation steam turbine. On the basisof the prior art, a determination module a and an alarm device are added to achieve removal of a power control loop, effectively prevent a unit from generating power fluctuation and power oscillationad emit an acousto-optic alarm after a steam turbine set is large in load deviation; a load deviation function is added to achieve that a high-pressure control valve can be switched on and off at variable speeds and reduce a small steam turbine load fluctuation amplitude; and a determination module b and a valve location manual input module are added to achieve a unit valve location maintenance function and a manual input valve location value function and effectively prevent the unit to generate power fluctuation and power oscillation. The method for prevention of generation of power oscillation in a main stop valve full-stroke test of a steam turbine provides a great guarantee for normal and smooth performing of the main stop valve full-stroke test of the steam turbine, and effectively reduces operators' burden.

Description

technical field [0001] The invention belongs to the technical field of thermal power generation, and in particular relates to a method for preventing power oscillation during a steam turbine for steam turbine power generation during a full stroke activity test of a main steam valve. Background technique [0002] During the load operation process of the large-capacity steam turbine belt, the load lifting of the steam turbine is realized through the switch of the high-pressure regulating valve GV. High-pressure main steam valve TV, medium-pressure main steam valve RSV and medium-pressure regulating valve IV remain fully open for a long time, and they are in a high-temperature and high-pressure environment for a long time, so it is easy to deposit oxides on the valve stem or valve sleeve gap At the same time, high temperature creep will cause problems such as bending of the steam valve stem and deviation of the center of the valve body. The steam turbine speeding accident caus...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G01M13/00
Inventor 徐章福邓彤天钟晶亮王家胜王文强王锁斌
Owner ELECTRIC POWER SCI RES INST OF GUIZHOU POWER GRID CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products